Analog Trunk (4Coidb) Daughter Board (Figure 2-28) - NEC UX5000 Hardware Manual

Chapter 2 - Blade Installation and Startup
2.7.2

Analog Trunk (4COIDB) Daughter Board (Figure 2-28)

The 4COIDB is used to provide 4 additional ports for loop/ground start trunks. The blade is connected to a
4COIU blade to provide a total of 8 ports for the combined blade (refer to 2.7.1 Analog Trunk (4COIU) Blade
(Figure 2-27) on page 2-55).
This daughter board can also be installed on the Digital/SLT Combination blade (082U). This combined blade
will provide 8 digital extension ports, 2 analog extension ports, and 4 trunk ports.
The analog trunk daughter board provides:
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4 analog loop start/ground start trunk circuits
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4 Caller ID circuits
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Connector for COIU or 082U blade
The 4COIDB consumes 4 trunk ports ranging between ports 001-200. The CN2 connector provides
connection to 4 analog trunk ports. The ground start ports are polarity sensitive (tip to tip, ring to ring) - the
loop start trunks are not. The power failure circuits (CN3), however, are not polarity sensitive.
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When using the COIU/COIDB for ground start trunks, the PBX ground
must be connected as described on page 1-69 or the trunks will not
function correctly.
●
The ground start trunk ports are polarity sensitive. Be careful when
wiring the trunks.
●
When connecting the RJ61 cables to the COIU/COIDB, note the
position of the Power Failure connector (CN3). Do not confuse this
connector as the trunk connector (CN2).
●
Switching from Loop Start to Ground Start is set in system
programming.
! Important !
Chapter 2